Calculatrice de Fractions Gratuite

Find the lowest common denominator (LCD) of the two denominators, rewrite both fractions over it, then add the numerators and keep the denominator. For 1/2 + 1/3 the LCD is 6, giving 3/6 + 2/6 = 5/6. The calculator shows each of those steps, so you can check your own working rather than just copying an answer.

Flip the second fraction and multiply. 1/2 ÷ 3/4 becomes 1/2 × 4/3 = 4/6, which simplifies to 2/3. Dividing by zero is undefined, so a second fraction with a numerator of 0 has no answer.

Yes. Type the whole number in the first box and the fraction in the two stacked boxes. Mixed numbers are converted to improper fractions internally (2 1/2 becomes 5/2) and the answer is given back in both forms. A minus sign on the whole number applies to the entire value, so -2 1/2 is -5/2, not -3/2.

Because 1/3 does not terminate as a decimal. The trailing character marks the difference between an exact decimal (3/4 = 0.75) and a rounded one. This is also why the arithmetic itself is done on integers rather than decimals: 1/3 + 1/3 + 1/3 is exactly 1 here, which is not something floating-point decimals can guarantee.

Yes. Every result is reduced to lowest terms by dividing the numerator and denominator by their greatest common divisor, and the step-by-step panel names the number it divided by. If the denominator reduces to 1, the answer is shown as a whole number.

No. The calculation runs entirely in your browser — there is no server request, no account and no logging. You can disconnect from the internet and it will still work.